\begin{tabular}{lcccc} \hline
 & (1) & (2) & (3) & (4) \\
VARIABLES & Orig. EI & New EI & Orig. SI & New SI \\ \hline
 &  &  &  &  \\
Education years & -0.0295 & -0.0117 & -0.0671 & -0.137*** \\
 & (0.0520) & (0.0545) & (0.0483) & (0.0415) \\
Constant & 0.0533*** & 0.0521*** & 0.0469*** & 0.0438*** \\
 & (0.00468) & (0.00587) & (0.00434) & (0.00402) \\
 &  &  &  &  \\
Observations & 1,852 & 1,682 & 1,908 & 1,824 \\
R-squared & 0.696 & 0.731 & 0.737 & 0.794 \\
 Twin pair FE & YES & YES & YES & YES \\ \hline
\multicolumn{5}{c}{ Robust standard errors in parentheses} \\
\multicolumn{5}{c}{ *** p$<$0.01, ** p$<$0.05, * p$<$0.1} \\
\end{tabular}
